My trackpad wasn't super oily but I've still never been able to get the grease off of it. After just a few seconds of wiping with the magic eraser, the trackpad was completely grease-free. Thank you readers! The video above shows the whole process wipe for wipe, but overall it's pretty simple:

Wet the magic eraser with lots of water.

Squeeze out the excess water.

Wipe your laptop's trackpad and keyboard a few times.

Dry off your laptop's trackpad and keyboard.

What's especially awesome is that you can reuse it. It's not until the magic eraser looks like a mangled clump that you have to throw it out. According to the box, it'll keep working until it looks like your cat coughed it up.